Molding form for concrete vessels



Jan. 12 ,1926. 1,568,957

E. M. CAMP HOLDING FORM FOR CONCRETE VE S S EL'S Filed March 15. 1924 2 shims-sheet 1 Jan. 12 1926. 1,568,957

E. M. CAMP HOLDING FORK FOR CONCRETE VESSELS Filed March 15, 1924 2 Sheets-Sheet 2 '""Hu annll wulun F ii I w --::r::r;-:111111:::122:; "1

To all whom it may concern:

Patented Jan. 12, 1926.

PATENT OFFICE.

ERVIN MOTT CAMROF CHICAGO, ILLINOIS.

IIIOLDING FORM FOR CONCRETE VESSELS.

-App1ication illedMerch 15, 19 24. Serial No. sea-e39.

Be it known that I, ERVIN MOTT CAMP, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois,have invented a new and useful Improvement in Molding Forms for Concrete Vessels, of which the following is a specification.

My invention relates to forms that are used in molding articles such as wash tubs, septic tanks, and Various containers of different kinds wherein there is to be formed a chamber adapted to become a closed tight chamber for holding. fluids of various kinds and it is laundry tu s. Y

My invention is especially desirable in connection with molding forms which are vibrated and the material compacted by vibratory motion and it isin relation to holding the form' parts on the inside of the chambers to be formed in the molded articles that this invention relates.

Thisinvention relates to the core of a molding apparatus that I have heretofore applied for a patent but may also relate to other molding devices. For concrete examples of the prior art," reference is made in this specification to my applications for patents which matured into. Patents No; 1,493,732, on May 13, 1924,,a-nd No. 1,519,902,

on Dec. 16, 1924.

Reference will be had to the accompany ing drawings in which Figure 1 is a transverse sectionthrough. the mold form showing the core'part in elevation.

Figure 2 showsa laundry tub for which the present drawing is made tocorrespond.

Figure 3 is a transverse elevation of the core pieces shown in reverse indicated in Flg. 1. v

Flgure 4 1s a plan view of the parts shown position to that in Fig. 3.

Figurel'fi is a section of a corner on line 5-5 of Fig. 4.

Figure 6 is an enlarged section through a corner on line 6-6 of Fig.

' Figures 7 and 8 are details described lately In .My invention has especially for its purpose the making of tight joints of the walls of the mold that will hold all ofthefluids of the concrete or plastic material used" in the molding even when theenti're mold is jolted and tpltlre :full extent necessary articularly adapted to molding to compact the concrete material into the either destroy entirely the usefulness of the:

article or make necessary repairs that never can be made equal to an article that has been perfectly molded and set. It is necessary,

in order to arrive at the best results to have the mold forms adapted to be inade completely Watertight so that concrete material having plenty of grouting fluid may be used and all of the grouting material retained in the finished article.

Heretofore in the manufacture of laundry tubs owing to the lack of having a tight mold form sufficient jolting or compacting has notbeen resorted toand this has prevented the manufacture of the highest quality of tubs and at thesametime has resulted in inc'reased cost of these articles. VYhereas, with my form of locking together the mold piecesI may use a greater percentage of broken stone and thus lessen the quantity of cement used and because of the fiuid character of the grout, it flows to the outside walls completely inclosing the aggregate or stone within the Walls of the material and producing a very fine finished article at less.

cost than has ever been heretofore accomplished in similar. articles. Because of the strong bond thereis obtained I need not use reinforcing for laundry tubs and other articles. 2 i

I am. able tov make my mold forms absolutely tightand solid through the medium of the interlocking members of the form l1erc tofore described in a patent for molding ma-- chines for shaping plastic material etc, issued Dec. 16, 1924, No. 1,519,902, relates to the principal parts save only to "the core memliersto which this application.relates and it is in the shape and interlocking of these core members and the means of their removal that is involved in this application.

walls 4: and 5 and suitable end pieces not shown and the core member 6 forming three walls of the chamber and the core end pieces 7 forming the end walls of the chamber which are locked to the piece 6.

The piece 6 is simply a sheet of metal starting as it were at 8, Figure 1 and bent over a corner at 9, bent at another corner 10 and terminating at the point 11 in the frame holding members. This piece 6 is provided, see Fig. 7, with a marginal block 12 having the undercut or hooked portion 13 binding the end edges of this member.

Secured into this member 6 are a series of eight studs 14, which are serviceable in removing the end pieces of this core member as will be described later.

The end pieces 7 which are connected to the piece 6 are flat sheets of metal bound on their margin by angle bars 15 and the latter bars are provided with the locking pieces 16 having the undercut or hooked portion 17 and these portions 12 and 16 are secured in place by suitable rivets 18 and 19 as shown, but of course they may be welded or be formed by forging or other suitable means out of the body of the material of the pieces 6 and 7. The end pieces that form this core are provided with cross angles 20 and 21 to which there are secured by bolts 22 the rods 23 and a series of turn buckles 24.

By means of these turn buckles 24 the end pieces 7 may be securely locked to the piece 6 by screwing the turn buckles to force a thrust between the two end pieces thus engaging the blocks 16 of the end pieces with the blocks 12 of the main portion 6 which causes a tight interlock of the said pieces being completely water tight provided of course, suitable fit is madein the first place and any dirt or other foreign matter is cleaned out before the pieces are put together.

The article is molded in the form shown in Fig. 1 wherein the plastic material is entered from the top and during the entry of this material the mold form is severely vibrated by means not shown in this application which are described in a patent for a concrete block forming machine issued May 13, 1924-, No. 1,493,732, and the material is thus compacted in place.

After the material is sufiiciently set the whole form is inverted allowing access to the turn buckles on the inside of the form as shown by Figures 3 and 4 and then the turn buckles are revolved in a direction that draws the end pieces 7 toward each other producing the disengagement of the blocks or margin pieces 12 and 16 from each other and should one of; the end pieces stick in place and cause all the movement effected by the turn buckles to. take place with one end only then when that end' comes in contact with the series of studs 'l-l next adjacent to it further movement will be arrested and the other end he forced loose from its engagement and thus both ends 7 will be free from the side wall 6 whereupon the end piece may be lifted out vertically as it were from the interior of the piece 6.

Vhen the end pieces are removed from engagement with the side wall pieces (3 then this later piece may be easily sprung loose by being slightly sprung inward at either or both top edges when in the position shown in Fig. 3 and thus easily withdrawn from the molded article.

In molding an article of this kind is highly desirable to have nice clean corners on the inside and I am able to arrive at this result with little expense be -ause of the simplicity of the structure of the core piece as described, for after the pieces 12 are sccured on to the piece 6 I grind off or round off the corner as indicated by 25, see Fig. 7, which results in leaving a nice smooth corner on the inside of the tub.

lVhere mold form pieces are connected as they must be connected generally in the corner regions it is particularly desirable that no leaking of the grout or fluids of the concrete take place for it is in these corner regions that there is most likely to occur the excess internal strains on the material of the tub due to the unequal direction and expansion produced by the hot and cold water used with these articles and therefore, my method of locking the mold parts together and making tight joints amounts to being the controlling factor between a success or failure in this work.

The method of first withdrawing the end pieces from the members 6 and the latter to be iiexed slightly allows the parts to be withdrawn from the molded article with less chance of accidental damage than is possible with any solid unitary core piece.

Vith a molded article severely jolted as I do there amounts to what might be termed a vacuum connection between the core mem bers and the walls of the molded articles which is not easily released without damage to the articles only as I gently flex or bend the member 6 which thus breaks the vacuum situation between these parts.

\Vhat I claim is 1. In a mold form. a core member con1- prising a side wall member bound on the edges with an undercut recntrant binding piece, in combination with end members having reciprocal undercut rcentranl binding members adapted to engage the aforementioned binding members and screw threaded rods connected across from end member to end member and adapted to hold and move the end members into engagement or disengagement with the wall member.

In a device of the class describech a core member composed of a wall piece extending down one set of walls and end pieces adapted to cooperate with the said wall piece and thus form a core block, reentrant interlocking margin on each of the pieces adapted to engage and hold each other in position; in combination with means for forcing and holding together the engagement of the parts.

3. In a device of the class described, a core block adapted to form a support about which plastic material maybe molded and said block composed of wall members having reentrant undercut margins adapted to interlock with each other and means for forcibly holding and forcibly disengaging the said parts from each other.

4. In a device of theclass described, a core block adapted toform a part of amolding apparatus for forming hollow articles out of plasticmaterial, said core block formed ofwalls'interlocked together by reentrant marginal pieces; in combination-with a series of turn buckles and rods connecting the parts together, and adapted through the medium of the turn buckles to be forced into engagement or release from engagement as desired.

a side wall member and end wall members,

adapted to be interlocked together by undercut portions on their edges; in combination with a series of screw threaded rods connecting across from one member to the other and adapted to force and hold into engagement the end with the side members and a series of stops adapted to limit the movement of one ofthe members when a definite amount is arrived at in the operation of disengaging the parts.

6. In a mold form for molding articles from plastic wet material, the means for joining the sections of the mold together composed of reentrant wedge shaped blocks adapted to interlock and draw the mold pieces together as the wedge blocks are pressed into engagement, with means for forcing the wedge blocks into engagement and for withdrawing them after the com pletion of the molding.

Signed at Chicago, in the county of Cook, and State of Illinois, this 10th day of March, 1924.

ERVIN MOTT CAMP. 

